Re: [heycam/webidl] Modernize invoking user code (#113)

>                  <li>
>                    Let <var>arg</var><sub>0..<var>n</var>−1</sub> be a list of
>                    ECMAScript values, where <var>arg</var><sub><var>i</var></sub> is the result
>                    of <a class="dfnref" href="#dfn-convert-idl-to-ecmascript-value">converting</a>
>                    <var>idlarg</var><sub><var>i</var></sub> to an ECMAScript value.
>                  </li>
> -                <li>Let <var>script</var> be the <a class="dfnref" href="#dfn-callback-context">callback context</a> associated with <var>V</var>.</li>
> -                <li>Push <var>script</var> on to the <a class="dfnref external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/webappapis.html">stack of incumbent scripts</a>. <a href="#ref-HTML">[HTML]</a></li>
> +                <li>Let <var>execution context</var> be <a class="external" href="https://tc39.github.io/ecma262/#sec-getfunctionrealm">GetFunctionRealm</a>(<var>X</var>)'s <a class="dfnref external" href="https://html.spec.whatwg.org/multipage/webappapis.html#concept-realm-settings-object">settings object</a>'s <a class="external" href="https://html.spec.whatwg.org/multipage/webappapis.html#realm-execution-context">realm execution context</a>.</li>

Oh, and also, what makes you think `GetFunctionRealm` won't just assert here?  Nothing guarantees that the `Get` returned a callable.

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